mirror of
https://github.com/kingecg/mpegts.git
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65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
package mpegts
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import (
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"errors"
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. "m7s.live/engine/v4"
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"m7s.live/engine/v4/codec"
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"m7s.live/engine/v4/codec/mpegts"
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)
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func AudioPacketToPES(frame AudioFrame, aac_asc codec.AudioSpecificConfig) (packet mpegts.MpegTsPESPacket, err error) {
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// var data []byte
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// for _, b := range frame.Raw {
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// data = append(data, b...)
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// }
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// if data, err = AudioPacketToPESPreprocess(data, aac_asc); err != nil {
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// return
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// }
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if frame.CodecID == codec.CodecID_AAC {
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packet.Header.PesPacketLength = uint16(7 + frame.AUList.ByteLength + 8)
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packet.Buffers = frame.GetADTS()
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} else {
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packet.Header.PesPacketLength = uint16(frame.AUList.ByteLength + 8)
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packet.Buffers = frame.AUList.ToBuffers()
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}
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// packetLength = 原始音频流长度 + adts(7) + MpegTsOptionalPESHeader长度(8 bytes, 因为只含有pts)
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// pktLength := len(data) + 8
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packet.Header.PacketStartCodePrefix = 0x000001
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packet.Header.ConstTen = 0x80
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packet.Header.StreamID = mpegts.STREAM_ID_AUDIO
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// packet.Header.PesPacketLength = uint16(pktLength)
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packet.Header.Pts = uint64(frame.PTS)
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packet.Header.PtsDtsFlags = 0x80
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packet.Header.PesHeaderDataLength = 5
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// packet.Payload = data
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return
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}
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func DecodeAudioSpecificConfig(audio []byte) (asc codec.AudioSpecificConfig, err error) {
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if len(audio) < 4 {
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err = errors.New("decodeAudioSpecificConfig error 1")
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return
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}
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// AACPacketType, 0 = AAC sequence header，1 = AAC raw
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if audio[1] != 0 {
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err = errors.New("decodeAudioSpecificConfig error : this packet is not AAC sequence header")
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return
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}
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// 前面有2个字节(音频信息)
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asc.AudioObjectType = (audio[2] & 0xF8) >> 3
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asc.SamplingFrequencyIndex = (audio[2] & 0x07 << 1) | (audio[3] >> 7)
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asc.ChannelConfiguration = (audio[3] >> 3) & 0x0F
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asc.FrameLengthFlag = (audio[3] >> 2) & 0x01
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asc.DependsOnCoreCoder = (audio[3] >> 1) & 0x01
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asc.ExtensionFlag = audio[3] & 0x01
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return
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}
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